led.c(11): error:  #20: identifier "LED_RED_GPIO_PORT" is undefined
led.c(11): error:  #20: identifier "LED_RED_GPIO_PIN" is undefined
led.c(12): error:  #20: identifier "LED_YELLOW_GPIO_PORT" is undefined
led.c(12): error:  #20: identifier "LED_YELLOW_GPIO_PIN" is undefined
list_test.c(11): warning:  #223-D: function "LED_Y_ON" declared implicitly
list_test.c(13): warning:  #223-D: function "LED_Y_OFF" declared implicitly
list_test.c(23): warning:  #223-D: function "LED_R_ON" declared implicitly
list_test.c(25): warning:  #223-D: function "LED_R_OFF" declared implicitly
